Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".

If "-transparent white" isn't the last attribute, then it doesn't show any effect.

"-shave 1" also don't show any effect, in any constellation. And "-bordercolor white -border 1" makes the wind rose ugly, the transparent parts in the middle gets white boarders too.

Maybe the problem is, because my starting image (the wind rose) has already a transparent background. But with white background and making this later transparent, the inner boarders of the arrow getting ugly ... I don't know what to do.

Maybe the problem is, because my starting image (the wind rose) has already a transparent background. But with white background and making this later transparent, the inner boarders of the arrow getting ugly ... I don't know what to do.

The problem is when you "-rotate" it adds a white background to the new outside areas of the overlay image. You need to specify "-background none" before the rotation so that won't happen. Then you won't need to make anything transparent because it will already be. Try this...